function s1_hello(){
	echo "hello,world!"
}
function s2_tell_who_i_am(){
	whoami
}
function s3_which_distro_do_i_use(){
	if [ -f /etc/os-release ]; then
	   . /etc/os-release
	    echo "NAME=\"$NAME\""
	else
            echo "无法确定发行版"
	fi
}
function s4_view_my_cpu_arch(){
	uname -m
}
function s5_show_first_scsi_disk_size(){
	size=$(lsblk -b -l | grep disk | grep '^nvme0n1 ' | awk '{print $4}')
	if [ -n "$size" ]; then
	    echo "$((size / (1024 * 1024 * 1024)))"
	fi
}
function s6_show_main_memory_size_in_megabytes(){
	free -m | grep "Mem:" | awk '{print $2}'
}
